Hello Venus's Nara and Hwang Chi Yeol showcased interesting chemistry on SBS's 'Laws of the Jungle' on November 4.  

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While looking for sustenance, Nara happened upon a pineapple and yelled in happiness. Hearing this from nearby, Hwang Chi Yeol came looking for her.  Thirsty, he said to Nara, "I will do you a favor later if you give me one bite of that pineapple," and she obliged.

During this scene, she called him teacher and admitted, "I'm not used to it yet, so I can't speak comfortably.  Teacher Hwang Chi Yeol was our vocal teacher.  We called him Teacher Chi Yeol.  He was our teacher since Hello Venus's early days."

He said to her, "Call me oppa from now on."